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Homework Help: Acceleration between two blocks

  1. Feb 3, 2010 #1
    1. The problem statement, all variables and given/known data
    A block of mass m1 = 280 g is at rest on a plane that makes an angle θ = 30° above the horizontal. The coefficient of kinetic friction between the block and the plane is μk = 0.10. The block is attached to a second block of mass m2 = 220 g that hangs freely by a string that passes over a frictionless and massless pulley. Find its speed when the second block has fallen 30.0 cm.

    2. The attempt at a solution

    Mass 1 Mass 2
    Fground=280*9.81=2746.8 N Fm2 ground=220*9.81=2158.2 N
    =433.714 N
    =250.405 N
    =25.04 N
    Fx= 250.405-25.04= 225.36N

    ax=.805 m/s2

    Hopefully this makes sense, but I am not sure if this is all correct and if it is, where to go from here. I'd really appreciate help!
    Thank you
  2. jcsd
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